Flowserve FIS120eng ISC User Instructions
Flowserve FIS120eng ISC is a cartridge mounted mechanical seal, designed for ease of installation and reliable operation. This seal is suitable for a wide range of applications, including ANSI and general purpose applications, thanks to its maximum interchangeability between designs.
The FIS120eng ISC seal is a robust and durable device, featuring a flexible stator pusher design that compensates for inadvertent misalignment of the seal chamber face. Multiple springs provide uniform face loading and are external of the process fluid, resisting clogging and stress corrosion.
The seal is available in both rotating and stationary bellows arrangements. Rotating bellows arrangements are used when the self-cleaning feature is required, and stationary bellows are used to compensate for inadvertent misalignment of the seal chamber face.
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ISC Series
Innovative Standard Cartridge seal designed for ANSI and general purpose applications with maximum interchangeability between designs.
Installation
Instructions
Experience In Motion
2
Description
This ISC seal is a cartridge mounted mechanical seal, designed for ease of installation and reliable operation. No seal setting dimensions are
required. Removable setting devices provide proper alignment.
The ISC seal family consists of:
ISC1PX - Single Pusher Seal stationary springs
ISC2PP - Dual Pusher Seal stationary springs
ISC1BX - Single Metal Bellows Seal rotating bellows (standard)
ISC2BB - Dual Metal Bellows Seal rotating bellows (standard)
ISC1SX - Single Metal Bellows Seal stationary bellows (optional)
ISC1EX - Single Elastomer Bellows Seal
ISC2SS - Dual Metal Bellows Seal stationary bellows (optional)
The flexible stator pusher design compensates for inadvertent misalignment of the seal chamber face. Multiple springs provide uniform face loading and are external of the process fluid, resisting clogging and stress corrosion.
The bellows design is available in both rotating and stationary bellows arrangements.
Rotating bellows arrangements are used when the self cleaning feature is required and stationary bellows are used to compensate for inadvertent misalignment of the seal chamber face.
Installation according to the following steps will assure long trouble free life of the seal.
1 Equipment Check
1.1 Follow plant safety regulations prior to equipment disassembly:
• lock out motor and valves.
• wear designated personal safety equipment.
• relieve any pressure in the system.
• consult plant MSDS files for hazardous material regulations.
1.2 Disassemble equipment in accordance with equipment manufacturer’s instructions to allow access to seal installation area.
1.3 Remove existing mechanical seal and gland or compression packing and packing gland.
The images of parts shown in these instructions may differ visually from the actual parts due to manufacturing processes that do not affect the part function or quality.
Seal Chamber Requirements
Figure 1
To first obstruction
Face of seal housing to be square to the axis seal chamber bore (0.013 mm) FIM and have a
√ μ μ a
Seal housing bore to have
(3.2 μ a
√ 125 μ inch
Sleeve or shaft finish to be
μ μ a
If the pump condition exceeds the above criteria (including consideration for thermal growth), consult
Flowserve Application Engineering for recommendations to avoid seal performance compromises.
1.4 Make sure the shaft or sleeve and the seal housing face are clean and free of burrs, cuts, dents, or corrosion that might cause leakage past the sleeve gasket or gland gasket. Replace worn shaft or sleeve. Remove sharp edges from keyways and threads.
1.5 Check equipment dimensions to ensure that they are within the specifications shown in Figures 1 and 2. Critical dimensions from
Figure 2 include:
• Box Bore (ØC)
• Box Depth (G)(Q)
• Distance to First Obstruction (K)
• Pump Frame accomodates Gland OD (ØE)
1.6 Check gland bolting to ensure the bolt diameter and bolt circle conform to the dimensions shown in Figure 2. Check gland bolt length to ensure adequate thread engagement for the actual seal gland.
1.7 Check gland bolt length to ensure adequate thread engagement for the actual seal gland. Gland dimensions are provided in the drawing that accompanied the seal.
1.8 Handle the ISC with care, it is manufactured to precise tolerances.
The sealing faces of the ISC seal are the rotating and stationary faces. They are lapped flat to within three helium light bands (34.8 millionths of an inch). Keep the seal faces perfectly clean at all
times.
3
ISC Dimensional Data Figure 2
G
F J
K
ISC1PX
Single Pusher
ØE ØC
ØA
Shaft Size
& Seal Size
G
F J
K
ISC1BX
Single Metal Bellows
ØC
ØA
Shaft Size
& Seal Size
4
All Dimensions millimeter
A
Shaft &
C
Box Bore
Seal Size (Min) (Max)
45
48
50
53
55
60
65
70
25
28
30
33
35
38
40
43
41.28 47.50
44.45 50.80
48.01 57.02
50.80 60.33
50.80 60.33
57.15 64.14
60.33 70.61
63.50 73.03
66.68 73.03
67.06 73.41
69.85 76.96
73.03 79.38
79.38 93.65
79.38 94.62
89.92 98.81
95.25 109.52
E
Gland
OD (Min)
93.7 - 95.3
93.7 - 95.3
106.4 - 108.0
109.7 - 111.3
109.7 - 111.3
119.1 - 120.7
119.1 - 120.7
125.5 - 127.0
125.5 - 127.0
136.4 - 137.9
127.0 - 130.0
150.9 - 152.4
160.5 - 162.1
160.5 - 162.1
179.5 - 181.0
182.6 - 184.2
F
Seal
Depth
5.13
5.13
5.13
5.13
5.13
5.13
1.93
5.18
5.38
5.38
5.38
5.38
5.38
5.38
5.13
5.13
G
Box Depth
(Min)
6.71
6.71
6.71
6.71
6.71
6.71
3.51
6.76
6.96
6.96
6.96
6.96
6.96
6.96
6.71
6.71
J K L M
Seal Dist. to Bolt
Extension Obst. Dia. Circle
Bolt
Slot
50.11
50.11
50.11
50.11
50.11
50.11
53.42
69.24
48.59
48.59
48.59
48.59
48.59
50.11
50.11
50.11
50.17
50.17
50.17
50.17
50.17
51.69
51.69
51.69
51.69
51.69
98.43
97.99
51.69 104.65
51.69 112.78
51.69 123.83
51.69 123.83
54.99 127.00
70.82 142.88
69.85
73.03
79.38
82.55
82.55
95.25
95.25
98.43
14.27
14.27
17.48
19.05
19.05
19.05
17.48
22.35
11.18
11.18
14.27
14.27
14.27
14.27
14.27
14.27
ØE
ISC2BB
Dual Metal Bellows
ØC
ØA
Shaft Size
& Seal Size
ISC2PP
Dual Pusher
G
F
G
F
J
K
J
K
ØE
ØC
ØA
Shaft Size
& Seal Size
ØE
Slotted Gland Detail
ØL
ØM
A
Shaft &
C
Box Bore
Seal Size (Min) (Max)
45
48
50
53
55
60
65
70
25
28
30
33
35
38
40
43
41.28 47.50
44.45 50.80
48.01 57.02
50.80 60.33
50.80 60.33
57.15 64.14
60.33 70.61
63.50 73.03
66.68 73.03
67.06 73.41
69.85 76.96
73.03 79.38
79.38 93.65
79.38 94.62
89.92 98.81
95.25 109.52
E
Gland
OD (Min)
93.7 - 95.3
93.7 - 95.3
106.4 - 108.0
109.7 - 111.3
109.7 - 111.3
119.1 - 120.7
119.1 - 120.7
125.5 - 127.0
125.5 - 127.0
136.4 - 137.9
127.0 - 130.0
150.9 - 152.4
160.5 - 162.1
160.5 - 162.1
179.5 - 181.0
182.6 - 184.2
F
Seal
Depth
48.34
48.34
48.34
48.34
48.34
48.34
45.06
61.70
46.69
46.69
46.69
46.69
46.69
48.34
48.34
48.34
G
Box Depth
(Min)
49.91
49.91
49.91
49.91
49.91
49.91
46.63
63.27
48.26
48.26
48.26
48.26
48.26
49.91
49.91
49.91
J K L M
Seal Dist. to Bolt
Extension Obst. Dia. Circle
Bolt
Slot
53.90
53.90
53.90
53.90
53.90
53.90
57.20
73.81
52.37
52.37
52.37
52.37
52.37
53.90
53.90
53.90
53.95
53.95
53.95
53.95
53.95
55.47
55.47
55.47
55.47
55.47
98.43
97.99
55.47 104.65
55.47 112.78
55.47 123.83
55.47 123.83
58.78 127.00
75.39 142.88
69.85
73.03
79.38
82.55
82.55
95.25
95.25
98.43
14.27
14.27
17.48
19.05
19.05
19.05
17.48
22.35
11.18
11.18
14.27
14.27
14.27
14.27
14.27
14.27
5
ISC Dimensional Data
G
F J
K
ISC1PX
Single Pusher
ØC
ØA
Shaft Size
& Seal Size
ØE
G
F J
K
ISC1BX
Single Metal Bellows
ISC1EX
Single Elastomer Bellows*
ØC
ØA
Shaft Size
& Seal Size
Q
P J
K
ØE
6
All Dimensions inch
A
Shaft &
C
Box Bore
Seal Size (Min) (Max)
E
Gland
OD
1.000 1.625 1.875 3.69 - 3.75
1.125 1.750 2.000 3.69 - 3.75
1.250 1.890 2.245 4.19 - 4.25
1.375 2.000 2.375 4.32 - 4.38
1.437 2.250 2.688 4.72 - 4.78
1.500 2.250 2.525 4.69 - 4.75
1.625 2.375 2.780 4.69 - 4.75
1.750 2.500 2.875 4.94 - 5.00
1.875 2.625 2.875 4.94 - 5.00
1.937 2.750 3.030 5.09 - 5.15
2.000 2.750 3.030 5.09 - 5.15
2.125 2.875 3.125 5.94 - 6.00
2.250 3.000 3.318 5.94 - 6.00
2.375 3.125 3.687 6.32 - 6.38
2.437 3.375 3.687 6.32 - 6.38
2.500 3.375 3.687 6.32 - 6.38
2.625 3.625 4.312 7.19 - 7.25
2.750 3.750 4.312 7.19 - 7.25
ØC
ØA
Shaft Size
& Seal Size
ØE
F G J K L M P * Q *
Seal Box Depth
Depth
Seal Dist. to Obst.
Bolt
(Min) Extension (Min)
Bolt Seal Box Depth
Circle Slot Dia. Depth (Min)
0.212
0.212
0.274
0.274
1.913
1.913
1.975
1.975
2.750 0.440 0.812 0.874
2.875 0.440 0.962 1.024
0.264
0.264
0.268
0.264
0.295
0.264
0.266
0.266
0.274
0.264
0.284
0.264
0.264
0.264
0.264
0.264
0.202
0.202
0.206
0.202
0.233
0.202
0.204
0.204
0.212
0.212
0.222
0.202
0.202
0.202
0.202
0.202
1.973
1.973
1.973
1.973
1.942
1.973
2.726
2.726
1.913
1.913
1.958
1.973
1.973
1.973
1.973
1.973
2.035
2.035
2.035
2.035
2.004
2.035
2.788
2.788
1.975
1.975
2.020
2.035
2.035
2.035
2.035
2.035
3.125 0.562 N/A N/A
3.250 0.440 1.127 1.189
3.750 0.560 N/A N/A
3.750 0.560 1.152 1.214
3.750 0.560 1.152 1.214
3.875 0.560 1.152 1.214
3.875 0.560 1.153 1.214
4.120 0.688 N/A N/A
4.120 0.688 1.152 1.214
4.440 0.750 1.092 1.154
4.440 0.750 N/A N/A
4.875 0.750 1.287 1.349
4.875 0.750 N/A N/A
4.875 0.750 1.287 1.349
5.625 0.880 1.129 1.191
5.625 0.880 1.129 1.191
*Dimensional items P & Q refer to Single Elastomer Bellows only
ISC2PP
Dual Pusher
G
F J
K
ØC
ØA
Shaft Size
& Seal Size
ØE
G
F J
K
ISC2BB
Dual Metal Bellows
ØC
ØA
Shaft Size
& Seal Size
Slotted Gland Detail
ØL
ØM
1.000
1.125
1.250
1.375
1.437
1.500
1.625
1.750
1.875
1.937
2.000
2.125
2.250
2.375
2.437
2.500
2.625
2.750
A C
Shaft & Box Bore
Seal Size (Min) (Max)
E F G J K L M
Gland
OD
Seal Box Depth Seal Dist. to Obst.
Bolt
Depth (Min) Extension (Min)
Bolt
Circle Slot Dia.
1.625 1.875 3.69 - 3.75 1.838
1.750 2.000 3.69 - 3.75 1.838
1.890 2.245 4.19 - 4.25 1.838
2.000 2.375 4.32 - 4.38 1.838
2.250 2.688 4.72 - 4.78 1.903
2.250 2.525 4.69 - 4.75 1.903
2.375 2.780 4.69 - 4.75 1.903
2.500 2.875 4.94 - 5.00 1.903
2.625 2.875 4.94 - 5.00 1.903
2.750 2.030 5.09 - 5.15 1.903
2.750 3.030 5.09 - 5.15 1.903
2.875 3.125 5.94 - 6.00 1.903
3.000 3.318 5.94 - 6.00 1.903
3.125 3.687 6.32 - 6.38 1.903
3.375 3.687 6.32 - 6.38 1.934
3.375 3.687 6.32 - 6.38 1.903
3.625 4.312 7.19 - 7.25 2.429
3.750 4.312 7.19 - 7.25 2.429
1.965
1.965
1.965
1.965
1.965
1.965
1.996
1.965
2.491
2.491
1.900
1.900
1.900
1.900
1.965
1.965
1.965
1.965
2.184
2.184
2.184
2.184
2.184
2.184
2.153
2.184
2.968
2.968
2.124
2.124
2.124
2.124
2.184
2.184
2.184
2.184
2.122
2.122
2.122
2.122
2.122
2.122
2.091
2.122
2.906
2.906
2.062
2.062
2.062
2.062
2.122
2.122
2.122
2.122
2.750 0.440
2.875 0.440
3.125 0.562
3.250 0.440
3.750 0.560
3.750 0.560
3.750 0.560
3.875 0.560
3.875 0.560
4.120 0.688
4.120 0.688
4.440 0.750
4.400 0.750
4.875 0.750
4.875 0.750
4.875 0.750
5.625 0.880
5.625 0.880
ØE
7
8
2 ISC Installation - Single Seal Design
Note: No seal setting measurements are needed to install the seal.
Instructions are for vertically split case end-suction ANSI pumps.
Modification of the procedure may be required for other style pumps. Consult Flowserve.
for
• An open end wrench for the gland bolt nuts
• 1/8" Allen wrench (provided)
• 3/16" Allen wrench (provided) for sizes >60 mm (>2.500")
Bearing Frame
2.2 Lubricate the shaft or sleeve lightly with silicone lubricant unless otherwise specified.
Setting Device
Figure 3
2.3 Tighten the setting device cap screws
2.4 Install the complete ISC cartridge assembly onto the shaft or sleeve with the setting devices near the bearing housing.
See Figure 3.
Bearing Frame
Pump
Back
Plate
2.5 Install the pump back
plate (seal chamber) and bolt it in place on the bearing frame. See
Figure 4.
Figure 4
2.5 Position the ISC with the gland tight against the seal chamber face.
If equipment conditions allow, position gland with the outlet port or plugged flush port as close to the 12:00 o'clock position as possible.
See Sections 3 and 4 for further piping considerations. Otherwise turn the gland so that the vent tap is as close to the 12:00 o’clock position as possible and so that the flush piping will clear the bearing frame.
Caution: Setting devices should not be removed or loosened before tighten- ing the gland bolts and tightening the set screws to the shaft.
Tighten the gland nuts evenly in a diagonal sequence. Do not over tighten the gland nuts, as this can warp seal parts and cause leakage.
Confirm adequate thread engagement before final torque setting.
The suggested ISC minimum torque values are as follows for seals with
these shaft sizes (in inches):
15 ft-lbs (20 N-m) 20 ft-lbs (27 N-m)
1.000
to
2.000
2.125 to
2.750
2.6 Assemble the pump. Avoid pipe
strain. Align coupling properly.
2.7 With the impeller, shaft, coupling,
and bearings in their final operating
positions, tighten the drive collar
set screws. See Figure 5.
Figure 5
Suggested minimum torque values for set screws are as follows:
Shaft Sizes 25 - 60 mm (1.000 - 2.500 inches)
1
4
4.5 N-m (40 inch-lbs)
Shaft Sizes 67 - 70 mm (2.625 - 2.750 inches)
3
8
" 13.6 N-m (120 inch-lbs)
2.8 Caution: Remove the setting
devices from the drive collar.
See Figure 6. Save these and the fasteners for future use when the pump impeller is reset or when the seal is removed for repairs.
2.9 Turn the shaft by hand to ensure unobstructed operation.
2.10 See Operational
Recommendations before start-up.
Figure 6
9
3 Single Seal Piping and OperationalRecommendation
3.1 Install an adequate seal flush system. The ISC requires a clean cool environment for maximum seal life. With a clean cool product, use a bypass flush from the pump discharge (piping plan 11*) or a bypass flush to the pump suction (piping plan 13). With clean hot products use a bypass flush through a cooler (piping plan 21). With abrasive products or products that are incompatible with the seal, use a flush from a clean external source (piping plan 32).
*Note: All piping plan designations used in these instructions are from API 682. for the corresponding ASME B73 piping plan designation, please add a
"73" in front of the referenced piping plan.
Q
F a
Rotation CCW b
F
CW
Rotation
D
Shaft rotation from exposed end of gland
For Piping Plans 11, 21 and 32:
Shaft Rotation
(from exposed end of gland)
Clockwise (CW)
Counterclockwise (CCW)
For Piping Plan 13:
Shaft Rotation
(from exposed end of gland)
Clockwise (CW)
Counterclockwise (CCW)
10
Figure 7
Inlet Plugged
Port
Port b Port a
Port a Port b
Outlet Plugged
Port
Port a Port b
Port b Port a
3.2 Use flush port that coincides with gland markings and direction of equipment rotation. Plug extra NPT opposite of flush. See Figure 7.
3.3 Taps and D in the gland are quench and drain ports used for fluid quenching, flush plan 62. If they are not used, they should be plugged with pipe plugs.
3.4 Remove lock outs on pump and valves.
3.5 Do not start up the equipment dry to check motor rotation or for any other reason. Open valves to flood pump with product fluid. Ensure that the seal flush system is operating. Vent air from the casing of the pump and the seal chamber before start-up.
3.6 Observe the start-up. If the seal runs hot or squeals, check the seal flush system. Do not allow the equipment to run for any extended time if the seal gets hot or squeals.
4 Dual Seal Piping and Operational Recommendations
4.1 Flush taps a and b in the gland are barrier fluid inlet and
outlet ports. Use Figure 8 to determine which ports to use as inlet and outlet.
Q
F a
Rotation CCW b
F
CW
Rotation
D
Shaft rotation from exposed end of gland
Inlet
Clockwise (CW)
Counterclockwise (CCW)
Port b
Port a
Figure 8
Outlet
Port a
Port b
11
12
4.2 For dual pressurized seal (double seal) operation, supply a clean compatible barrier fluid to the inlet port at a pressure at least
170 kPa (25 psi) above the seal chamber pressure. See Figure 9.
The pressure of the barrier fluid must not exceed the recommended maximum pressure. Flowserve can supply information on barrier fluid flow requirements based on seal size, product temperature, barrier fluid characteristics, and shaft speed.
4.3 For dual unpressurized (tandem seal) operation, supply a clean compatible buffer fluid to the inlet port at a pressure below the seal chamber pressure. See Figure 10. The pressure in the seal chamber must not exceed the recommended maximum pressure.
Flowserve can supply information on buffer fluid flow requirements based on seal size, product temperature, buffer fluid characteristics, and shaft speed.
Double ISC with Supply Tank
Figure 9
Bypass
Flush to
Gland
Flush Port
Orifice
Option
Supply Tank
Assembly with
Cooling Coils
1.2 m (4 feet) maximum
Pressure
Source
0.45 - 0.6 m
(1.5 - 2 feet) minimum
4.4 The Flowserve Supply Tank is designed to work with the ISC Dual
Seal to form a self-contained sealing system. The new circulating feature in the ISC provides a positive barrier fluid flow from the seal cavity to the Supply Tank and back to the seal. In most cases the natural cooling of the piping and tank are adequate to remove seal generated heat. Cooling coils are available with the Supply Tank to increase heat dissipation. The Supply Tank can be used with the
ISC dual seal in both the dual pressurized or dual unpressurized operating modes.
Recommendation: For enhanced seal performance and reduced coking, use DuraClear as a barrier fluid. Refer to DuraClear brochure
FSD123 or contact a Flowserve seal application engineer for further details.
Tandem ISC with Supply Tank Figure 10
Bypass
Flush to
Gland
Flush Port
Orifice
Option
Supply Tank
Assembly with
Cooling Coils
1.2 m (4 feet) maximum
Vent to Vapor
Recovery
0.45 - 0.6 m
(1.5 - 2 feet) minimum
13
14
5 Operational Recommendations
5.1 Do not exceed corrosion limits. The ISC is designed to resist corrosion by most chemicals. However, do not expose the ISC materials of construction to products outside of their corrosion limits.
The ISC assembly drawing lists the materials of construction.
Consult Flowserve for chemical resistance recommendations.
5.2 Do not exceed the recommended maximum pressure and
speed limits shown in the ISC brochure.
5.3 Do not exceed the temperature limits of the ISC. The materials of construction are listed on the ISC assembly drawing. For dual seals using supply tanks with cooling coils, turn on cooling water to the supply tank before start-up.
5.4 Do not start up or run the ISC dry. Buffer/barrier fluid must be in the seal cavity for dual seals at all times during pump operation.
Process fluid must be in the pump volute at all times during single seal operation.
6 Repairs
This product is a precision sealing device. The design and dimension tolerances are critical to seal performance. Only parts supplied by
Flowserve should be used to repair a seal. To order replacement parts, refer to the part code and B/M number. A spare backup seal should be stocked to reduce repair time.
When seals are returned to Flowserve for repair, decontaminate the
seal assembly and include an order marked "Repair or Replace." A
signed certificate of decontamination must be attached. A Material
Safety Data Sheet (MSDS) must be enclosed for any product that came in contact with the seal. The seal assembly will be inspected and, if repairable, it will be rebuilt, tested, and returned.
15
TO REORDER REFER TO
B/M #
F.O
.
FIS120eng REV 09/2018 Printed in USA
To find your local Flowserve representative and find out more about Flowserve Corporation, visit www.flowserve.com
Flowserve Corporation has established industry leadership in the design and manufacture of its products.
When properly selected, this Flowserve product is designed to perform its intended function safely during its useful life. However, the purchaser or user of Flowserve products should be aware that Flowserve products might be used in numerous applications under a wide variety of industrial service conditions.
Although Flowserve can provide general guidelines, it cannot provide specific data and warnings for all possible applications. The purchaser/user must therefore assume the ultimate responsibility for the proper sizing and selection, installation, operation, and maintenance of Flowserve products. The purchaser/user should read and understand the Installation Instructions included with the product, and train its employees and contractors in the safe use of Flowserve products in connection with the specific application.
While the information and specifications contained in this literature are believed to be accurate, they are supplied for informative purposes only and should not be considered certified or as a guarantee of satisfactory results by reliance thereon. Nothing contained herein is to be construed as a warranty or guarantee, express or implied, regarding any matter with respect to this product. Because Flowserve is continually improving and upgrading its product design, the specifications, dimensions and information contained herein are subject to change without notice. Should any question arise concerning these provisions, the purchaser/user should contact Flowserve Corporation at any one of its worldwide operations or offices.
© 2012 Flowserve Corporation
USA and Canada
Kalamazoo, Michigan USA
Telephone: 1 269 381 2650
Telefax: 1 269 382 8726
Europe, Middle East, Africa
Etten-Leur, the Netherlands
Telephone: 31 765 028 200
Telefax: 31 765 028 487
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Singapore
Telephone: 65 6544 6800
Telefax: 65 6214 0541
Latin America
Mexico City
Telephone: 52 55 5567 7170
Telefax: 52 55 5567 4224 flowserve.com

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